We're looking for a lake area where we can camp and rent jetskis. Western Washington would be ideal, but the Chelan/Wenatchee are would do too (though we'd rather not go much further east than Moses Lake or thereabouts.)
sanddune
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There are several local water sporting businesses in all areas that will rent jet skis, kayaks, boats, etc. Some may have locations on the lake; but most (for a fee) will drop off the jet ski or allow you to tow it on the back of your truck/SUV.
Since there are so many vendors, your best bet is to do a Yahoo or Google search on "jet ski rentals seattle" "jet ski rentals lake chelan" "jet ski rentals (input your Washington state destination)" and talk directly with these people/businesses that pop up.
Niccole B
Check-out this website for all WA parks and what they offer. Hope this helps. Lots of beautiful places to visit in WA. Have fun!
http://www.parks.wa.gov/